摘要
为深入研究复相陶瓷在冲击加载下的宏观力学响应特性与微观断裂机制,选取Al_(2)O_(3)/SiC复相陶瓷为研究对象,设计了一维应力波和平面冲击波加载测试方法,研究了材料动态强度及其应变率效应、高压Hugoniot曲线以及不同受力特征下的材料局部变形机制。结果表明:不同的宏观受力特征下复相陶瓷对应有不同的微观断裂机理;冲击加载下材料的宏观变形主要是脆性破坏,但从微观角度观察,大尺寸晶粒穿晶断裂以及小尺寸晶粒沿晶断裂存在明显的局部塑性变形特征;第二相SiC颗粒在晶界和晶粒内部诱导裂纹传播,起到了冲击能量再分配的作用。
The macroscopic mechanical response and micro-fracture mechanism of Al_2O_3/SiC composite as a multiphase ceramic under impact loading were investigated.The dynamic strength and strain rate sensitivity were analyzed by load tests methods of one-dimensional stress wave and plane shock wave.The Hugoniot curve of high pressure and local deformation characteristics of material were determined at different stress modes.The results show that the micro-fracture mechanism of the multiphase ceramic differs with the macro-stress characteristics.The macro-deformation of the multiphase ceramic is mainly a brittle failure under impact loading.However,there are some local plastic deformation characteristics on the transcrystalline fracture of large grain and the intergranular fracture of small grain.The SiC particles as a second phase induce crack propagation at grain boundaries and within grains,which plays an important role in the redistribution of impact energy.
作者
高玉波
葛彦鑫
卢涛
蔡宣明
张红艳
GAO Yubo;GE Yanxin;LU Tao;CAI Xuanming;ZHANG Hongyan(School of Aerospace Engineering,North University of China,Taiyuan 030051,China;State key laboratory of Explosive Science and technology,Beijing Institute of Technology,Beijing 100081,China;College of Aerospace Engineering,Chongqing University,Chongqing 400044,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2023年第12期3114-3120,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(12172337,12272356)
山西省基础研究计划(2021030212302)。
关键词
冲击动力学
氧化铝/碳化硅复相陶瓷
力学性能
微观结构
断裂
shock dynamics
alumina/silicon carbide multiphase ceramics
mechanical property
microstructure
fracture mechanism
作者简介
第一作者:高玉波(1986-),男,博士,副教授。
